| Raises ValueError if the value is not present. | | insert(...) -- More -- 这里我们看到了关于 list 这个类,Python 提供的所有方法,可以直接调用,例如统计列表中单词 hello 的个数: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 >>>a="hello,world,hello,python" >>> a.split(",")....
def create_dictionaries(words): word_to_int_dict = {w:i+1 for i, w in enumerate(words)} int_to_word_dict = {i:w for w, i in word_to_int_dict. items()} return word_to_int_dict, int_to_word_dict word_to_int_dict, int_to_word_dict = create_dictionaries(vocab) int_to_wo...
#定义获取多只股票函数: def get_stocks_data(stocklist,start,end): all_data={} for code in stocklist: all_data[code]=pro.daily(ts_code=code, start_date=start, end_date=end) return all_data #保存本地 def save_data(all_data): for code,data in all_data.items(): data.to_csv('c...
type(pd.array), type(pd)Names = 'Type','Function','Module','Other'Types = {}for f in funcs:t = type(eval("pd."+f))t = Names[-1 if t not in types else types.index(type(eval("pd."+f)))]Types[t] = Types.get(t,[])+[f]for n in Names:print...
position (0th index), looking for the element you are searching for. When it finds the value - it returns the position and exits the system. However, this is not too efficient when going through a large list, and you need to get the position of something towards the end of the list....
importinspectdefget_variable_name(var):forname,valueininspect.currentframe().f_back.f_locals.items():ifvalueisvar:returnname my_list=[1,2,3]print(get_variable_name(my_list))# 输出 'my_list' 1. 2. 3. 4. 5. 6. 7. 8. 9. ...
def count(self, value): # real signature unknown; restored from __doc__ (用于统计某个元素在列表中出现的次数) """ L.count(value) -> integer -- return number of occurrences of value """ return 0 1. 2. 3. #!/usr/bin/python aList = [123, 'xyz', 'zara', 'abc', 123]; prin...
1importtime2importthreading34defaddNum():5globalnum#在每个线程中都获取这个全局变量6print('--get num:',num )7time.sleep(1)8num -=1#对此公共变量进行-1操作910num = 100#设定一个共享变量11thread_list =[]12foriinrange(100):13t = threading.Thread(target=addNum)14t.start()15thread_list....
| encoding defaults to sys.getdefaultencoding(). | errors defaults to 'strict'. | | Methods defined here: | | __add__(self, value, /) | Return self+value. | | __contains__(self, key, /) | Return key in self. | | __eq__(self, value, /) | Return self==value. | | _...
fillna(value=None,method=None,axis=None,inplace=False,limit=None,downcast=None,**kwargs) value:用于填充的数值。 method:表示填充方式,默认值为None。 limit: 可以连续填充的最大数量,默认None。 method参数不能与value参数同时使用。 有一张表格里存在缺失值,如果使用常量66.0来替换缺失值,那么填充前后的效果...